Fluid-pressure switch.



Patented Sept. 16, 1913.

2 SHEETS-SHEET 1.

witnesses J. A. SCHADEL. FLUID PRESSURE SWITCH.

APPLIOATION FILED FEB.14, 1911. RENEWED MAY 3, 1913.

1,073,175. Patented Sept. 16,1913.

' 2 ISHEETS-SHEET 2.

JOHN ALBERT SCHADEL, OF PITTSBURGH, PENNSYLVANIA.

FLUID-PBESSURE SWITCH.

Specification of Letters Patent.

Patented sept. 16, 1913.

Application filed February 14, 1911, Serial No. 608,544. Renewed May 3,1913. Serial No. 765,894.

To all whom, it may concern:

Be it known that I, JOHN ALBERT ScHA; DEL, citizen of the United States,residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new and useiul Improvements inFluid-' Pressure Switchesg-oiwhich the following is a specification.

This invention relates to a governor and more specifically to governorsfor compressed air tanks and has for itsobject to provide a means bywhich the air compressing means may be cut off when a certain pressureis reached, and startedagain as soon as the pressure has dropped belowthe desired point.

A further object is to provide a tension device for a piston or plungerremovably engaging the cylinder and suitably guiding the forwardprojecting portion of the piston rod whereby the piston will encountermore or less resistance against its movement in the cylinder. 1

With the above and other objects in view, I have. invented the governorillustrated in the accompanying drawings in which the governor is shownin use with an air compressor, but it will beunderstood that it may beused in other situations as well without sacrificing any of the benefitsaccruing therefrom.

Figure 1 is a side elevation of my invention, Fig. 2 is a longitudinalsectional view therethrough, Fig. 3 is a top plan view of my device,Fig.4 is an end view thereof, Fig. 5 is a detail view of a piston androd therefor, Fig. 6 is a detail sectional view of a coupling membershown in elevation and,

Fig. 7 is a detail longitudinal sectional view' of a spring compressingmember or tGIlSlOIl.

regulator.

'Referring to the accompanying drawings, 1 is a base upon which ismounted a cylinder 2, having an air inlet 3, which is screw threaded onits end 4 by means of which it is connected up with a-comprcssed airtank. One end5 is internally screwthreaded to receive the externallyscrewthreaded bushing or cylindrical tension regulating member 6,provided with a centrally disposed opening 7 therein, through which apiston rod 8, the free end of which is secured to a piston 9, located inthe cylinder 2, passes. The bushing 6 is formed with a relatively longwith a number of projecting socket 6', and mounted upon the piston rod 8is a spring 10, one end of which abuts the shoulder 11 of the socket 6'and the other end of which abuts the member 12'on the piston 8, which isadapted to hold a packing 13 in place. Nuts 14 and 15 are adapted tohold the members'9 and 12,.tightly. against the packing 13. The piston 9is provided members 16, which are adapted to prevent the piston fromgetting too close to the opening 3, in which event sufficient air couldnot get into the cylinder 2 to operate the piston. A larger and strongerspring the piston rod 8 over the weaker. spring 10,

being shorter in length with respectthere to and arranged to fit thesocket of the bushing 6, being held therein against the movement of thepiston. When it is desired to secure a very great pressure in the airtank, the bushing 6 may be screwed into the cylinder 2 until theshoulder 1.1 thereof engages the strong spring, thus bringing it intooperation.

The cushion regulated piston herein disclosed may be utilized to controlthe operation of any actuator for an air compressor having a disengagingmember which the piston rod may engage to render said actuator inactiveand I have shown itused in connection with an electric cut-01f.

The end 18 of the piston rod 8 is connected to a push member 19 of anelectric "cutoff 2O which-is secured to a bracket 21 mounted on the base1, an insulating mem her being placed between the switch and the ismounted on v bracket. The members 8 and 1-9 are con- 'nected by acoupling 23, having a shoulder.

24 thereon which engages the screw thread 25 screwed into the end of themember 19 and a pin 26 which passes through the coupling and anopeningin the piston rod 8.

is extremely- The operation of the device simple and is as follows: Whena redetermined air pressure is-reached in t e air tank'the'piston 9forces the piston rod 8 out and being coupled to thepush pin 19 on thecutoff 20, a suitable switch is operated to break the circuit to thecompressor which stops the motor or engine used for compressing theair,and when the air pressure in the tank drops below the normalpressure it is desired to maintain, the springs 10 and 17 come intoaction and :force the piston toward the air inlet, thus drawing in thepiston rod and completing the electric circuit for restarting theengine.

I claim and desire to secure by Letters Patent r A compressed airactuated electric circuit maker and breaker consisting of a pistonchamber, an air inlet in one end thereof, a

plug screw threaded in the other end thereof, said plug having a bore inits inner end and an opening through its outer end, :1 cylinder engagingpiston in said cylinder, a

rod connected to said piston and extending through said opening, a longspring of weak tension and a short sprlng of strong tension mounted onsaid rod and directly abutting said piston, said long spring constantlya abutting the inner end wall of said plug,

said wall being removable from engagement with said short spring, acoupling on the outer end of said rod and an electrical contact adaptedto be engaged and operated by said coupling.

In testimony whereof I aflix my signature in presence of two witnesses.

.IOHN ALBERT SCHADEL.

Witnesses:

J. SCHAUER, GEO. WEDDERBURN.

